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1/*
2 * NVIDIA Tegra DRM GEM helper functions
3 *
4 * Copyright (C) 2012 Sascha Hauer, Pengutronix
5 * Copyright (C) 2013 NVIDIA CORPORATION, All rights reserved.
6 *
7 * Based on the GEM/CMA helpers
8 *
9 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16#include <linux/dma-buf.h>
17#include <drm/tegra_drm.h>
18
19#include "gem.h"
20
21static inline struct tegra_bo *host1x_to_tegra_bo(struct host1x_bo *bo)
22{
23 return container_of(bo, struct tegra_bo, base);
24}
25
26static void tegra_bo_put(struct host1x_bo *bo)
27{
28 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
29 struct drm_device *drm = obj->gem.dev;
30
31 mutex_lock(&drm->struct_mutex);
32 drm_gem_object_unreference(&obj->gem);
33 mutex_unlock(&drm->struct_mutex);
34}
35
36static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt)
37{
38 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
39
40 return obj->paddr;
41}
42
43static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt)
44{
45}
46
47static void *tegra_bo_mmap(struct host1x_bo *bo)
48{
49 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
50
51 return obj->vaddr;
52}
53
54static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
55{
56}
57
58static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page)
59{
60 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
61
62 return obj->vaddr + page * PAGE_SIZE;
63}
64
65static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page,
66 void *addr)
67{
68}
69
70static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
71{
72 struct tegra_bo *obj = host1x_to_tegra_bo(bo);
73 struct drm_device *drm = obj->gem.dev;
74
75 mutex_lock(&drm->struct_mutex);
76 drm_gem_object_reference(&obj->gem);
77 mutex_unlock(&drm->struct_mutex);
78
79 return bo;
80}
81
82static const struct host1x_bo_ops tegra_bo_ops = {
83 .get = tegra_bo_get,
84 .put = tegra_bo_put,
85 .pin = tegra_bo_pin,
86 .unpin = tegra_bo_unpin,
87 .mmap = tegra_bo_mmap,
88 .munmap = tegra_bo_munmap,
89 .kmap = tegra_bo_kmap,
90 .kunmap = tegra_bo_kunmap,
91};
92
93static void tegra_bo_destroy(struct drm_device *drm, struct tegra_bo *bo)
94{
95 dma_free_writecombine(drm->dev, bo->gem.size, bo->vaddr, bo->paddr);
96}
97
98struct tegra_bo *tegra_bo_create(struct drm_device *drm, unsigned int size,
99 unsigned long flags)
100{
101 struct tegra_bo *bo;
102 int err;
103
104 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
105 if (!bo)
106 return ERR_PTR(-ENOMEM);
107
108 host1x_bo_init(&bo->base, &tegra_bo_ops);
109 size = round_up(size, PAGE_SIZE);
110
111 bo->vaddr = dma_alloc_writecombine(drm->dev, size, &bo->paddr,
112 GFP_KERNEL | __GFP_NOWARN);
113 if (!bo->vaddr) {
114 dev_err(drm->dev, "failed to allocate buffer with size %u\n",
115 size);
116 err = -ENOMEM;
117 goto err_dma;
118 }
119
120 err = drm_gem_object_init(drm, &bo->gem, size);
121 if (err)
122 goto err_init;
123
124 err = drm_gem_create_mmap_offset(&bo->gem);
125 if (err)
126 goto err_mmap;
127
128 if (flags & DRM_TEGRA_GEM_CREATE_TILED)
129 bo->flags |= TEGRA_BO_TILED;
130
131 if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
132 bo->flags |= TEGRA_BO_BOTTOM_UP;
133
134 return bo;
135
136err_mmap:
137 drm_gem_object_release(&bo->gem);
138err_init:
139 tegra_bo_destroy(drm, bo);
140err_dma:
141 kfree(bo);
142
143 return ERR_PTR(err);
144}
145
146struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
147 struct drm_device *drm,
148 unsigned int size,
149 unsigned long flags,
150 unsigned int *handle)
151{
152 struct tegra_bo *bo;
153 int ret;
154
155 bo = tegra_bo_create(drm, size, flags);
156 if (IS_ERR(bo))
157 return bo;
158
159 ret = drm_gem_handle_create(file, &bo->gem, handle);
160 if (ret)
161 goto err;
162
163 drm_gem_object_unreference_unlocked(&bo->gem);
164
165 return bo;
166
167err:
168 tegra_bo_free_object(&bo->gem);
169 return ERR_PTR(ret);
170}
171
172struct tegra_bo *tegra_bo_import(struct drm_device *drm, struct dma_buf *buf)
173{
174 struct dma_buf_attachment *attach;
175 struct tegra_bo *bo;
176 ssize_t size;
177 int err;
178
179 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
180 if (!bo)
181 return ERR_PTR(-ENOMEM);
182
183 host1x_bo_init(&bo->base, &tegra_bo_ops);
184 size = round_up(buf->size, PAGE_SIZE);
185
186 err = drm_gem_object_init(drm, &bo->gem, size);
187 if (err < 0)
188 goto free;
189
190 err = drm_gem_create_mmap_offset(&bo->gem);
191 if (err < 0)
192 goto release;
193
194 attach = dma_buf_attach(buf, drm->dev);
195 if (IS_ERR(attach)) {
196 err = PTR_ERR(attach);
197 goto free_mmap;
198 }
199
200 get_dma_buf(buf);
201
202 bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
203 if (!bo->sgt) {
204 err = -ENOMEM;
205 goto detach;
206 }
207
208 if (IS_ERR(bo->sgt)) {
209 err = PTR_ERR(bo->sgt);
210 goto detach;
211 }
212
213 if (bo->sgt->nents > 1) {
214 err = -EINVAL;
215 goto detach;
216 }
217
218 bo->paddr = sg_dma_address(bo->sgt->sgl);
219 bo->gem.import_attach = attach;
220
221 return bo;
222
223detach:
224 if (!IS_ERR_OR_NULL(bo->sgt))
225 dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
226
227 dma_buf_detach(buf, attach);
228 dma_buf_put(buf);
229free_mmap:
230 drm_gem_free_mmap_offset(&bo->gem);
231release:
232 drm_gem_object_release(&bo->gem);
233free:
234 kfree(bo);
235
236 return ERR_PTR(err);
237}
238
239void tegra_bo_free_object(struct drm_gem_object *gem)
240{
241 struct tegra_bo *bo = to_tegra_bo(gem);
242
243 if (gem->import_attach) {
244 dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
245 DMA_TO_DEVICE);
246 drm_prime_gem_destroy(gem, NULL);
247 } else {
248 tegra_bo_destroy(gem->dev, bo);
249 }
250
251 drm_gem_free_mmap_offset(gem);
252 drm_gem_object_release(gem);
253
254 kfree(bo);
255}
256
257int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
258 struct drm_mode_create_dumb *args)
259{
260 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
261 struct tegra_bo *bo;
262
263 if (args->pitch < min_pitch)
264 args->pitch = min_pitch;
265
266 if (args->size < args->pitch * args->height)
267 args->size = args->pitch * args->height;
268
269 bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
270 &args->handle);
271 if (IS_ERR(bo))
272 return PTR_ERR(bo);
273
274 return 0;
275}
276
277int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
278 uint32_t handle, uint64_t *offset)
279{
280 struct drm_gem_object *gem;
281 struct tegra_bo *bo;
282
283 mutex_lock(&drm->struct_mutex);
284
285 gem = drm_gem_object_lookup(drm, file, handle);
286 if (!gem) {
287 dev_err(drm->dev, "failed to lookup GEM object\n");
288 mutex_unlock(&drm->struct_mutex);
289 return -EINVAL;
290 }
291
292 bo = to_tegra_bo(gem);
293
294 *offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
295
296 drm_gem_object_unreference(gem);
297
298 mutex_unlock(&drm->struct_mutex);
299
300 return 0;
301}
302
303const struct vm_operations_struct tegra_bo_vm_ops = {
304 .open = drm_gem_vm_open,
305 .close = drm_gem_vm_close,
306};
307
308int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
309{
310 struct drm_gem_object *gem;
311 struct tegra_bo *bo;
312 int ret;
313
314 ret = drm_gem_mmap(file, vma);
315 if (ret)
316 return ret;
317
318 gem = vma->vm_private_data;
319 bo = to_tegra_bo(gem);
320
321 ret = remap_pfn_range(vma, vma->vm_start, bo->paddr >> PAGE_SHIFT,
322 vma->vm_end - vma->vm_start, vma->vm_page_prot);
323 if (ret)
324 drm_gem_vm_close(vma);
325
326 return ret;
327}
328
329static struct sg_table *
330tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
331 enum dma_data_direction dir)
332{
333 struct drm_gem_object *gem = attach->dmabuf->priv;
334 struct tegra_bo *bo = to_tegra_bo(gem);
335 struct sg_table *sgt;
336
337 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
338 if (!sgt)
339 return NULL;
340
341 if (sg_alloc_table(sgt, 1, GFP_KERNEL)) {
342 kfree(sgt);
343 return NULL;
344 }
345
346 sg_dma_address(sgt->sgl) = bo->paddr;
347 sg_dma_len(sgt->sgl) = gem->size;
348
349 return sgt;
350}
351
352static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
353 struct sg_table *sgt,
354 enum dma_data_direction dir)
355{
356 sg_free_table(sgt);
357 kfree(sgt);
358}
359
360static void tegra_gem_prime_release(struct dma_buf *buf)
361{
362 drm_gem_dmabuf_release(buf);
363}
364
365static void *tegra_gem_prime_kmap_atomic(struct dma_buf *buf,
366 unsigned long page)
367{
368 return NULL;
369}
370
371static void tegra_gem_prime_kunmap_atomic(struct dma_buf *buf,
372 unsigned long page,
373 void *addr)
374{
375}
376
377static void *tegra_gem_prime_kmap(struct dma_buf *buf, unsigned long page)
378{
379 return NULL;
380}
381
382static void tegra_gem_prime_kunmap(struct dma_buf *buf, unsigned long page,
383 void *addr)
384{
385}
386
387static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
388{
389 return -EINVAL;
390}
391
392static void *tegra_gem_prime_vmap(struct dma_buf *buf)
393{
394 struct drm_gem_object *gem = buf->priv;
395 struct tegra_bo *bo = to_tegra_bo(gem);
396
397 return bo->vaddr;
398}
399
400static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr)
401{
402}
403
404static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
405 .map_dma_buf = tegra_gem_prime_map_dma_buf,
406 .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
407 .release = tegra_gem_prime_release,
408 .kmap_atomic = tegra_gem_prime_kmap_atomic,
409 .kunmap_atomic = tegra_gem_prime_kunmap_atomic,
410 .kmap = tegra_gem_prime_kmap,
411 .kunmap = tegra_gem_prime_kunmap,
412 .mmap = tegra_gem_prime_mmap,
413 .vmap = tegra_gem_prime_vmap,
414 .vunmap = tegra_gem_prime_vunmap,
415};
416
417struct dma_buf *tegra_gem_prime_export(struct drm_device *drm,
418 struct drm_gem_object *gem,
419 int flags)
420{
421 return dma_buf_export(gem, &tegra_gem_prime_dmabuf_ops, gem->size,
422 flags);
423}
424
425struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
426 struct dma_buf *buf)
427{
428 struct tegra_bo *bo;
429
430 if (buf->ops == &tegra_gem_prime_dmabuf_ops) {
431 struct drm_gem_object *gem = buf->priv;
432
433 if (gem->dev == drm) {
434 drm_gem_object_reference(gem);
435 return gem;
436 }
437 }
438
439 bo = tegra_bo_import(drm, buf);
440 if (IS_ERR(bo))
441 return ERR_CAST(bo);
442
443 return &bo->gem;
444}